POLARIS MK-BST40-251 Box Mikuni Carburetor Rebuild Kit

( Engine Type: 2-stroke ), ( Type: Carburator Kit ), ( Machine Type: Atv ), ( Manufacturer Part Number: MK-BST40-251 ), ( Country Of Origin: Japan )

Review POLARIS Open Box Mikuni Carburetor Rebuild Kit fits 500

Introducing the Polaris MK-BST40-251 Box Mikuni Carburetor Rebuild Kit for the Polaris 500 engine, designed to help you breathe new life into your aging carburetor. This comprehensive rebuild kit contains all the essential components needed for a thorough and successful rebuild process, ensuring optimal performance and fuel efficiency for your Polaris vehicle.

The heart of this kit is the Mikuni Carburetor, a renowned name in the world of high-performance carburetors. The BST40 model is specifically engineered for the Polaris 500 engine, promising a perfect fit and seamless integration. This carburetor is renowned for its ability to deliver precise fuel-air mixtures, crucial for efficient combustion and superior engine response.

The Polaris MK-BST40-251 Box Mikuni Carburetor Rebuild Kit includes an extensive list of components, ensuring a complete and effective rebuild. These components include:

1. New gaskets: High-quality gaskets designed to ensure a tight seal between various components of the carburetor, minimizing leaks and maximizing performance.

2. New jets: A set of new fuel jets, available in various sizes, to allow for fine-tuning the fuel mixture for optimal engine performance.

3. New needles: New needle valves to regulate the fuel mixture and ensure proper engine idle and response.

4. New floats: New float bowls and floats to maintain an adequate fuel level and ensure consistent fuel delivery to the engine.

5. New main jets: New main jets to regulate the primary fuel mixture and optimize engine performance.

6. New pilot jets: New pilot jets to regulate the secondary fuel mixture and ensure proper engine idle.

7. New emulsion tubes: New emulsion tubes to mix the fuel and air efficiently and evenly.

8. New needle jets: New needle jets to regulate the fuel mixture during deceleration and throttle closure.

9. New throttle plates: New throttle plates to ensure proper throttle response and control.

Rebuilding your carburetor with the Polaris MK-BST40-251 Box Mikuni Carburetor Rebuild Kit is an excellent investment for any Polaris 500 engine owner. Not only will it restore your carburetor to its original performance level, but it will also extend its lifespan and save you the cost of a new carburetor. With this kit, you'll enjoy smoother engine operation, improved fuel efficiency, and a more enjoyable riding experience.

Polaris MK-BST40-251 Box Mikuni Carburetor Rebuild Kit 500: A Comprehensive Analysis

The Polaris MK-BST40-251 Box Mikuni Carburetor Rebuild Kit 500 is a popular choice among ATV and snowmobile enthusiasts for maintaining or restoring their engines. In this analysis, we will discuss the key features, advantages, and disadvantages of this rebuild kit to help you make an informed decision.

1. Compatibility: This rebuild kit is designed for Polaris snowmobiles and ATVs equipped with the Mikuni BST 40 carburetor.

2. Included Components: The kit comes with various gaskets, o-rings, needles, jets, and other necessary parts for a complete rebuild.

3. Instruction Manual: A detailed instruction manual is provided to guide users through the rebuild process.

1. Cost-Effective: Rebuilding your existing carburetor using this kit is typically cheaper than purchasing a new one.

2. Customizability: The kit allows you to customize your carburetor's performance by selecting the appropriate needle and jet sizes.

3. Improved Engine Performance: A well-rebuilt carburetor can lead to improved engine performance, increased power, and better fuel efficiency.

1. Time-Consuming: Rebuilding a carburetor can be a time-consuming process, especially for those without prior experience.

2. Requires Tools: To rebuild the carburetor, you will need various tools such as a carburetor rebuild kit, a clean workspace, and possibly a carburetor balancing kit.

3. Potential for Error: Improper reassembly or use of incorrect parts can lead to decreased performance or engine damage.

The Polaris MK-BST40-251 Box Mikuni Carburetor Rebuild Kit 500 offers a cost-effective and customizable solution for maintaining or restoring the performance of your Polaris snowmobile or ATV equipped with a Mikuni BST 40 carburetor. However, the rebuild process can be time-consuming, requiring tools, a clean workspace, and patience. It is essential to follow the instructions carefully to avoid errors and potential engine damage.

If you are comfortable working on your Polaris's carburetor, have the necessary tools and time, and desire improved engine performance, the Polaris MK-BST40-251 Box Mikuni Carburetor Rebuild Kit 500 is a worthwhile investment. Alternatively, consider seeking professional assistance to ensure a successful rebuild.

part # mkbst40251 prices

• $12.62-$65.00

specifications iodacarb:

• for models: 500
• for makes: Polaris
• engine type: 2-stroke
• type: Carburator Kit
• machine type: Atv
• manufacturer part number: MK-BST40-251
• country of origin: Japan

shipping iodacarb:

• service: Economy
• type: Fixed
• transit: 4-9 Days
• class: Economy
• cost: $0.00

payments iodacarb:

• other
• wallet: Paypal
• credit card: Diners-club

seller iodacarb:

• # reviews: 8666
• rating: 99.4%

returns iodacarb:

• paid by: Seller
• policy: Returns Accepted
• time: 30 Days

offer iodacarb:

• started: April 16, 2026
• sold: 0
• options: Ship-to-home
• quantity: 1
• availability: In Stock

general iodacarb:

• Motorcycle Scooter Parts Accessories > Air Intake Fuel Delivery > Carburetors
• condition: New other see details

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